Which of the following statements about malaria is true?
A) Malaria is the greatest health threat to northern Eurasia and North America.
B) Mosquito saliva transmits tiny sporozooites to the victim when they are bitten.
C) The organism that causes malaria is a virus related to H5N1.
D) Malaria can be transmitted to humans by contact with pig or bird feces.
B
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Calcite is one of the minerals that exhibits ________ when a ray of light is split into two components as it travels through a crystal.
A. double refraction B. polymorphism C. striations D. compositional zoning E. cleavage
Examine the map of the plate boundaries and answer this question.
Oceanic lithosphere is being recycled at ________.
A. H B. G C. C D. D
What is a possible cause of the extinction event called the Great Dying?
A. a sudden increase in the oxygen content of the atmosphere during the Precambrian B. a great outpouring of lava at the end of the Paleozoic C. a new kind of super predator that devoured nearly all of the life in the oceans D. a meteorite impact that killed the dinosaurs
The joints in the photograph mimic topography, indicating that they formed
A) while the granite was still molten.
B) while the rocks were still buried at great depth.
C) when the weight of overlying rocks was unloaded, allowing expansion along the joints.
D) along a subduction zone.